I write the sickest shit to hit white sheets since cross burning Caucasoid

Lyric Meaning

Sickest is a colloquial often used by rappers to say that their rhymes,lines, etc. are “good” or “nice”

When Vakill says

White sheets

He’s referencing to paper, in which he writes the “sickest shit” upon. The comparison to

I write the sickest shit to hit white sheets

and

cross burning Caucasoid

is that a Caucasoid is a person of Caucasian features; a caucasian. A “cross burning Caucasoid” is a cross-burning Caucasian, an act affiliated with the notorious white-supremesist Ku Klux Klan group who are known for burning crosses. When he says “sickest shit” he is implying that the act of burning a cross is vile, and that he is “sicker” in the way rappers use it as a colloquial, better.